The Simpsons: Season 6 - Episode 17 (1989)

Homer must turn to his sisters-in-law for a loan. Relishing Homer's degradation, Patty and Selma make him their slave. But when the sisters are caught smoking on the job, Homer reluctantly covers for them, saving their jobs. Meanwhile, Bart is late to sign up for a gym class and must take the only class still open -- ballet....